I just so happens a few days ago I was browsing through some stuff on ebay, when I saw a Philips ISA TV tuner listed for sale. They had a link to the drivers. Perhaps this is the same card you have.

Zinwell ZAT-600B tuner review: NextGen TV, internet optional This is the first ATSC 3.0 tuner set-top box to support encrypted broadcast television without requiring a connection to the internet.